A two-dimensional finite element model for PTFE composite with random distributed circular graphite particles was developed to study its effective thermal conductivity. The experiments on thermal conductivities of these composites were conducted. Results from experiments and finite element analysis (FEA) were compared which show that non-uniform distribution lead to low thermal conductivity and there is a saturated conductivity ratio of the inclusion to the matrix at a certain volume fraction. The saturated ratio rises with the increasing of volume percentage.
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